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Subsequent Events	3 Months Ended
Subsequent Events	Apr. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	12. Subsequent Event On May 19, 2016, the Company entered into a new credit agreement with its banks (“New Credit Agreement”) that replaces the Company’s existing credit agreement. The New Credit Agreement provides for a $400 million asset-based revolving credit facility maturing on May 19, 2021. Additionally, during the term of the New Credit Agreement, the Company may increase the commitments by up to $200 million, subject to customary conditions. Interest is determined, at the Company’s option, by the federal funds rate plus a margin of 0.125 percent to 0.375 percent or the LIBOR rate plus a margin of 1.125 percent to 1.375 percent depending on availability under the New Credit Agreement. In addition, the Company will pay a commitment fee of 0.20 percent per annum on the unused portion of the commitments.